Checksums Guide: CRC32, MD5, and SHA-256 for Data Validation
The difference between checksums and cryptographic hashes, when each is appropriate, and why you should never use CRC for security.
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Tags: security, hashing, developer-tools
Checksums: CRC32, MD5, SHA-256, and When to Use Each Not every integrity check is a security check. A file transfer over a reliable corporate network needs error detection, not cryptographic protection. An email attachment needs virus scanning more than hash comparison. A software download from the internet needs authentication, not just integrity. Choosing the right checksum algorithm means understanding what each one actually guarantees. What a Checksum Provides A checksum is a compact representation of a data set. Its purpose is detection: run the same algorithm on two copies of the data, and if the checksums match, the data is (with overwhelming probability) identical. The differences between checksum algorithms come down to: Speed: How fast can you compute it? Collision resistance:…
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